中文摘要：

首先采用一定的超细化方法和表面改性方法，对粉体进行超细化和表面改性处理；其次，选择XT30ESEM—TMP环境扫描电镜，对碳酸氢钠超细粉体进行表面结构特性的观察和研究，探讨尺寸改变以及采用一定表面改性处理对灭火介质表面结构的影响规律；最后，通过灭火试验平台，对不同粒径的碳酸氢钠超细粉体的灭火性能进行研究，探讨粒径改变对灭火效率的影响．试验结果表明，采用超细化方法和表面改性方法，可以大幅度改善粉体的表面特性，减轻超细化处理后粉体易团聚的缺陷；同时，粉体的灭火性能也得到了大幅度提高．

英文摘要：

XT30 environmental scanning electron microscope is used to observe the surface structure of sodium bicarbonate superfine powder, and the influence of diameter change and surface modification on surface structure is discussed. Besides, the fire-extinguishing ability of superfine powder of different grain size is also studied by a series of tests. The results show that the surface characteristics and fire-extinguishing ability of powders are greatly improved by using the methods proposed in this paper.